Chemistry Chpt 4: Hmwk problems

Hydrobromic acid dissolves solid iron according to the following reaction: Fe(s)+2HBr(aq)→FeBr2(aq)+H2(g) Problem Q: What mass of H2 would be produced by the complete reaction of the iron bar? (2 sig figs)

0.14g

Calculate how many moles of NO2 form when each quantity of reactant completely reacts via the following reaction: 2N2O5(g)→4NO2(g)+O2(g) Problem Q: 17.0 g N2O5 (3 sig figs)

0.315 mol

Hydrobromic acid dissolves solid iron according to the following reaction: Fe(s)+2HBr(aq)→FeBr2(aq)+H2(g) Problem Q: What mass of HBr (in g) would you need to dissolve a 3.8-g pure iron bar on a padlock? (2 sig figs)

11g

Calculate how many moles of NO2NO2 form when each quantity of reactant completely reacts via the following reaction: 2N2O5(g)→4NO2(g)+O2(g) Problem Q: 6.8 mol N2O5 (2 sig figs)

14 mol

In a popular classroom demonstration, solid sodium is added to liquid water and reacts to produce hydrogen gas and aqueous sodium hydroxide. Problem Q: Enter a balanced chemical equation for this reaction. (Express as a chemical equation, include phases)

2Na(s)+2H2O(l)→H2(g)+2NaOH(aq)

Selenic acid (H2SeO4) forms when solid selenium dioxide reacts with gaseous oxygen and liquid water to form aqueous selenic acid. Problem Q: Enter a balanced chemical equation for this reaction.

2SeO2(s)+O2(g)+2H2O(l)→2H2SeO4(aq)

Calculate how many moles of NO2 form when each quantity of reactant completely reacts via the following reaction: 2N2O5(g)→4NO2(g)+O2(g) Problem Q: 2.6 mol N2O5 (2 sig figs)

5.2 mol

Calculate how many moles of NO2 form when each quantity of reactant completely reacts via the following reaction: 2N2O5(g)→4NO2(g)+O2(g) Problem Q: 3.03 kg N2O5 (3 sig figs)

56.1 mol

Find the limiting reactant for each initial amount of reactants in the following reaction: 2Na(s)+Br2(g)→2NaBr(s) Problem Q: 2.5 mol Na and 1 mol Br2 (name the element)

Br2

Complete and balance each of the following combustion reaction equations. Problem Q: C4H10(g)+O2(g)→ (Express as a complete chemical equation, include phases)

C4H10(g)+O2(g)→8CO2(g)+10H2O(g)

Complete and balance each of the following combustion reaction equations. Problem Q: C5H12S(l)+O2(g)→ (Express as a complete chemical equation, include phases)

C5H12S(l)+O2(g)→5CO2(g)+6H2O(l)+SO2(g)

Complete and balance each of the following combustion reaction equations. Problem Q: Mg(s)+O2(g)→ (Express as a complete chemical equation, include phases)

Mg(s)+O2(g)→2MgO(s)

Find the limiting reactant for each initial amount of reactants in the following reaction: 2Na(s)+Br2(g)→2NaBr(s) Problem Q: 1.7 mol Na and 1.3 mol Br2 (name the element)

Na

Find the limiting reactant for each initial amount of reactants in the following reaction: 2Na(s)+Br2(g)→2NaBr(s) Problem Q: 12.8 mol Na and 6.9 mol Br2 (name the element)

Na

Find the limiting reactant for each initial amount of reactants in the following reaction: 2Na(s)+Br2(g)→2NaBr(s) Problem Q: 3 mol Na and 3 mol Br2 (name the element)

Na

Complete and balance each of the following combustion reaction equations. Problem Q: S(s)+O2(g)→ (Express as a complete chemical equation, include phases)

S(s)+O2(g)→SO2(g)

Compute the theoretical yield of the product (in moles) for each of the following initial amounts of reactants: Ti(s)+2Cl2(g)→TiCl4(s) Problem Q: 8 mol Ti and 19 mol Cl2 n(TiCl4):

n= 8 mol

Compute the theoretical yield of the product (in moles) for each of the following initial amounts of reactants: Ti(s)+2Cl2(g)→TiCl4(s) Problem Q: 12.8 mol Ti and 18.6 mol Cl2 n(TiCl4):

n= 9.3 mol

compute the theoretical yield of the product (in moles) for each of the following initial amounts of reactants: (1 S.F) Ti(s)+2Cl2(g)→TiCl4(s) Problem Q: 2 mol Ti and 2 mol Cl2 n(TiCl4):

n=1 mol